High astigmatism: rigid lenses only
A rigid lens gives steadier, sharper vision than a soft toric, without the vision drifting during the day.
- 01Keratoconus: five custom lens options
- 02High myopia: large-diameter lenticular RGP
- 03High astigmatism: rigid lenses only
- 04High hyperopia: why custom soft comes first
- 05Presbyopia: multifocals measured, not guessed
- 06Prosthetic lenses: appearance, comfort and vision
- 07Severe dry eye: scleral lenses for surface repair
Rigid lenses only
Part 03 · 01For patientsA rigid lens gives steadier, sharper vision than a soft toric, without the vision drifting during the day.
Better optics
RGP optics give sharper vision than soft torics at high cylinder.
Better stability
With back-surface or bitoric RGPs, the more toric the cornea, the better the lens stabilises.
Vision that drifts
Lens thickness at these powers makes vision vary through the day.
Mild irritation
The top-to-bottom thickness difference from prism ballast causes mild irritation.
We don’t use soft torics for high cylinder. The stabilisation point applies to back-surface and bitoric RGP designs, not soft torics.
Why this differs from high hyperopia
Part 03 · 02Like high myopia, high astigmatism gains optics and stability from a rigid lens. High plus RGPs have to stay small and tend to drop, so high hyperopia usually starts with custom soft.
High hyperopia →Key takeaways
Part 03- 01High astigmatism: RGP only
- 02Back-surface and bitoric RGPs stabilise better on a more toric cornea
- 03Soft torics at high cylinder drift through the day and irritate
Book a contact lens assessment.
Optometrists and ophthalmologists can refer through our referral form.
General health information only, not personal advice. Everyone’s eyes are different. An optometrist or doctor should examine you before any treatment is decided.